<style>
    .topic {
        width: 200px;
        position: fixed;
        right: 50px;
        bottom: 50px;
        z-index: 10;
    }

    .getSubject {
        width: 80%;
        background-color: #559cff;
        color: white;
        padding: 10px;
        display: flex;
        justify-content: center;
        align-items: center;
        margin: 10px auto;
        cursor: pointer;
    }
</style>
<div class="topic">
    <div class="getSubject" onclick="getSubjectFunc()">解析页面题目到服务器</div>
</div>